Can't help with the switches, however I moved from Gateron Brown to Halo True. They're very different in feel (as can be seen by the graphs if you care to look them up). The Browns feel cheap in comparison and I love the Trues.

Stabs are still knock-offs. Authentic can be had for 9 euro shipped. https://deskthority.net/for-sale-f55/cherry-stabilizer-sets-t16806.html

Some people have complained that there's too much texture on them but I think they're fine. The lights look pretty spectacular shining through the lettering. I can't give you a comparison to Vortex as I haven't used Vortex before, sorry mate. All in all I think the keyboard is fantastic. The build quality is superb.

Awesome, you're going to love it. It'll take a day or two to get used to the Trues but they're amazing. They're designed so that you don't bottom out the keys, so keep that in mind. They are silky smooth. I wont use anything else now ;)

Kailh coppers feel pretty gross IMO. You're already in the bump right at the beginning without any travel, and there's a strong reverse bump-clack which makes it feel like you have to take the finger off the cap to complete the keypress cycle. Out of all the tactile switches I've tried, this is by far, the worst. For anyone wanting to stick to the tried-and-true brown forumla, I recommend going with Kailh brown for this drop. I've never tried the Halo switches so I can't comment.